Test of Dynamic Strength Characteristics of Lishi Loess

Nian Qin Wang; Xiao Ling Liu; Bo Han; Bo Tao Liu

doi:10.4028/www.scientific.net/AMM.303-306.2902

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Analysis of Dynamic Reliability on Large-Span Bridge
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Natural Period of Masonry in-Filled R/C Frame Structures Tested in Earthquake Field Investigation
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Elastic Parameters Adjusted in Soil Slope Stability and Displacement Analysis
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Field Measurement and Numerical Simulation of Vibration Effect on Metro Depot Superstructure Caused by Passing Trains
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Research on Correlation between Urban Low-Noise Pavement Air Voids and Sound Absorption Coefficient
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Test of Dynamic Strength Characteristics of Lishi Loess
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Determination on Interlayer Separation Threshold of Complex Roof with Mechanics Properties
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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 303-306Test of Dynamic Strength Characteristics of Lishi...

Test of Dynamic Strength Characteristics of Lishi Loess

Abstract:

Lishi loess is an important component of loess slope. To explore the structure and strength change characteristics of Lishi loess caused by shock (vibration) action, and to reveal the mechanism of loess slope catastrophe, the dynamic triaxial test was performed by using equivalent sine wave under strain controlling. The results show that:① There is an obvious stress relaxation phenomenon during the same cyclic loading test, the degree decreases with the increasing of dynamic strain and confining pressure. And the influence of dynamic strain variation on stress relaxation degree is less under high confining pressure than under low confining pressure;② Under a confining pressure of 40kPa, within 1% strain ranges, the needed dynamic stress to reach the specified strain is just 0.01kN, and the peak stress decreases with the augmentation of dynamic strain, when peak stress increases to 0.204kN, the sample is destructed; Under a confining pressure of 90kPa, soil radial particles are closely spaced, within 2% strain ranges also only a dynamic stress of 0.01kN is needed to reach the specified strain, and with the increase of dynamic strain, the samples are destructed when dynamic strain increases to 0.267kN. The dynamic failure stress of Lishi loess increases gradually with the increase of confining pressure, and the linear regression equation is бd=0.0011б3+0.1590, the correlation coefficient is 0.9944. ③According to Mohr-Coulomb failure criterion, the strength parameters of Lishi loess in somewhere of the north of shaanxi are C=30.33kPa，φ=14°. Under the dynamic shearing action, the dynamic effective strength parameters are obviously less than static effective strength parameters, this indicates that the soil consolidation effect reduced and the particles displaced and occluded each other.

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Periodical:

Applied Mechanics and Materials (Volumes 303-306)

Pages:

2902-2907

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.303-306.2902

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Online since:

February 2013

Authors:

Nian Qin Wang, Xiao Ling Liu, Bo Han, Bo Tao Liu

Keywords:

Dynamic Strength, GDS Lab System, Lishi Loess, Test Analysis

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